Regenerative open-hearth furnace



Sept. 11, 1928. 1,683,656

S. J. CORT REGENERATIVE OPEN HEARTH FURNACE Filed Dec. 21, 1923 3 .Sheets-Sheet l 2,22 ii a* M, AF/

INVENTOR ATTORNEY Sept. 11, 1928. 1,683,656

, s. J. coRT REGENERATIVE OPEN HEARTH FURNACE Filed Deo. 21, 1925 s sheets-shea v3 A INVENTOR ATTORNEY ABY Patented Sept. 11, 1928.

UNirED STATES `PATENT orifice.

STEWART J. GOBT, OF BETHLEHEM, PENNSYLVANIA, ASSIGNOR TO BETHLEHEM STEEL COMPANY, OF BETHLEHEM, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

REGENERATIVE OPEN-HEARTH FURNACE.

Application filed. December 21, 1923. Sera] No. 681,940.

My invention relates to regenerative open hearth furnaces, more particularly to that YYtype vhaving lateral reentrant or so-called -monkey walls at the ends of a furnace, and 5 it has for its object to provide a furnace of this characterhaving a roof whose edges terminate at the walls .of the furnace including v the reentrant portions thereof, whereby air may freely circulate against the exterior walls i of the furnace without the formation of dead air spaces or pockets. A further object of my invention is to provide a regenerative furnace having reentrant side walls at its ends and channel members l which follow the outline of and are arranged on top of the walls, the channel meinbers serving to support the roof.

Lateral reentrant `or monkey walls`for regenerative `furnaces serve to impart .proper directive effects to incoming combustion gases. T he construction of these walls as triangular solid masses of masonry is objectionable on account of the intense heat developed at the region thereof. Consequently, adopting the principle familiar to those skilled in .the art that a thin 4wall provides for a better radiation than a thick wall, it was obvious and' logical to avoid thick masonry construction at these points and to provide the monkey wall construction merely by having the side walls indented or made reentrant at the ends, whereby. such walls might be of a uniform thickness throughout. In so far as I am aware, however, it'lias been the customary practice to4 provide furnace roofs of uniform widths from end to end, so that projecting eaves extend over the reentrant side walls. A roof constructed in this manner limits circulation of air against the exterior of the reentrant walls and forms in effect dead air spaces or pockets with respect to thelatter. Appreciating that the durability of these highly heated reentrant walls might be 'extended by better cooling, I provide a roof construction which is made to follow the outline of the furnace Walls. o

Apparatus made in accordance with my invention is illustrated in the accompanying drawings, forming a part of this application, in which Figure '1 is a fragmentary vertical section taken along the line I-I of Figure 2, showing one end of a furnace having my improved monkeyfwall and roof construction;

Figure 2 is a fragmentary plan view of Vcrowning necessitates inclination the lportion of the furnace shown in Figure Figure 3 is a horizontal sectional View taken along the line III- III of Figure 1 Figure 4 is a vertical sectional view taken along the line IV-IV of Figure 2 looking in the direction of the arrows;

Figure 5 is a perspective and diagrammatic view to show the outline of the monkey walls and the roof; and, e 65 Figures 6 and 7 are detail views showing an arrangement of skew back channels for the reentrant side walls.

In the drawings, I show an open hearth regenerative furnaceof the reversing type including a melting chamber 10 which communicates at its ends through ports 11 with end chambers 12, the latter in turn being in communication with air and gas uptakes 13 and 14, respectively. 75

The melting chamber 10 is defined by substantially parallel vside walls 15 which are continuous with inwardly converging wall portions 16'at the ends thereof, the latter walls merging into substantially parallel relativ-ely short walls 17, which are joined to diverging wall portions 18, the vlatter wall portions constituting the sides walls of the end chambers 12. The walls 18 merge into substantially parallel wall portions 19 which constitute outside wallsof the air uptakes 13 at the upper ends of the latter. lVall portions 16 and 18 constitute monkey walls of the reentrant type.

In order to give the proper directive effect 0C' to gases entering the melting chamber the roofsA 2O of the end chambers 12 are inclined downwardly toward the melting chamber as indicated in Figure 1. The inclinedroofs 20 are joined by a horizontally extending roof 20 for the melting chamber. Since the roofs are crowned and have their lateral edges terminating at vthe outside edges of the walls 15, 16, 17, 18 and 19, it will be apparent that such of the tops 100 of the walls 16 downwardly toward the tops of the walls 15. As will be clear from Figuie 5 and as may be seen from Figure 1 the tops of the walls 19, 17 and 14 are substantially horizontal but that the walls 19 arc 105 higher than the walls 17 and that the latter walls are higher than the walls 15, thereby necessitating downward inclination of the tops of the walls 18 toward the tops of the walls 17 and further downward inclination of 110 the tops of the walls 16 toward the tops of the walls 15. Skew back channels 22 are arranged yat the .tops of the walls 15, 16, 17, 18 and 19 and such channels follow the outline of the side walls. The roofs 20 and 20 are supported in the usual manner by the skew back channels.

Buckstays 24 cooperateswith the outside of l the skew back channels and tension rods 25 connect opposed buckstays in the ordinary way. Upon reference to Figures 2, 3, 6, and 7, it will be noted that one pair of buckstays 24 is inset in order to aiit'ord lateral support to the inset or knuckle portion 26 of the skew vback channel 22 which rests on top of the wall portion 17, opposed buckstays 24 being secured to ether by the tension rod 25. The downward -inclined portions 27 and 28 of the skew ack channels arranged, respectively, above the wall portions 18 and 16 receive considerable thrust due to the load of the roof; and, consequently, I .further brace.

the ortions 27 and 28 of the skew back channel y means of braces 29 and 30 connected to buckstays 24: below theskew back channel and connected to the portions 27 and 28 of the latter at intermediate points between the buckstays 24' and the adjoining buckstays 24.

In addition to the tension rods for holding the buckstays in osition the latter are supported in a well'- own manner by binding members 31.

From the foregoing description, it will be apparent that I have provided a regenerative furnace having reentrant monkey walls at its ends with a roof construction which terminates at the outside or upper edges of the walls, thereby avoiding any outwardly-ex- 4tending eaves and providing for free circulation of 'airagainst the walls and avoiding the lformation of dead spaces or pockets,

Ywhereby the reentrant monkey Ywalls are cooled to the best advantage.

While I have shown my invention in but one form, it will be obvious to those skilled in the art that it is not so limited, but is susceptible of various other changes andmodiications Vwithout departing from the spirit thereof, and I desire therefore, that only such limitations shall be placed thereupon as are imposed by the prior art or as are specically set forth in the appended claim.

Having thus described the invention what' stays for the parallel walls between the con- Y verging and diverging walls and the convergingand diverging skew back channels at the top ofthe converging and diverging walls, and a. roof supported by the skew back channels.

In testimony whereof I hereunto aix my signature this 5th day of December, 1923.`

' STEWART J. CORT. 

